Razor blade



March 31, 1931. SWAN 1,798,283

RAZOR BLADE Filed July 1, 1930 I l 1 q ,6 2/ m 2 x i5 'T''- 17 INVE'NT R d b! f1: ATTORNEY Patented Mar. 31, 1931 11m swan, or new You, 11. Y.

nAzon. BLADE Application filed July 1,

My invention relates to the safety razor art and particularly to safety razors employing blades ofthe double edged type.

In razors of this type the blade in held between-two members comprising a blade holder. One or more'apertures are provided through the central portion of the blade and engage pins or lugs on one .of the holder members in order to accurately position the blade with respect to the holder. The removal of the material from the central portion of the blade in order to form these apertures necessarily weakens the blade. Due

to this weakening when the blade is clamped in the holder the cutting edges of the blade will not ,be in a straight line but will be slightly warped, particularly when the blade is not clamped tightly in the holder, as is the case when a close shave is desired.

One of the objects of my invention is to provide reenforcing means on the more central portion of the blade in order to counter-act the weakening caused by the apertures in the blade.

Another object of my invention is to provide a blade having a central portion adjacent the apertures thieker than the portion of the blade adjacent the cutting edges in order that the central portion will be clamped in the holder.

Further. objects and advantages will ap pear from the following specification taken in connection with the accompanying drawing which is to be considered a part of this specificationand on whichi Fi 1 is a top yiew of a razor blade embodying a preferred form of my invention;

Fig. 2 is a cross-sectional view taken on the line 2'-2 of Fig. 1;

Fig. 3 is a cross-sectional view of the blade shown in Figs. 1 and 2 in a holder.

Fig. 4 is a bottom view of the razor blade in place on the cap of the holder; and Fig. 5 is a top view of the razor place on theguard of the holder.

Referrin to the drawing, reference character 10 indicates generally the safety razor blade having-two cutting edges 11 and 12. The blade is generally rectangular in shape but is provided at either end with lips 13 and 1930. Serial No. 465,082.

blade in- 14. In forming the blade a generally rectangular piece of material having lips 13 and 14 is stam ed from a large sheet or strip of material. the stamping operation the blade is out along the dotted line 15 and along the lines 16, 17, 18, 19, 20 and 21, as shown in Fig. 1. The material bounded by these lines may then be folded back and pressed into position on the adjacent part of the blade. This operation may be performed while the material is cold and before the blade is tempered or the material ma be folded while heated so as to relieve al internal strains. The result is a longitudinal slot formed in the more central portion of the blade withre-enforcing members 22 and 23 on either side thereof. The lips 13 and 14' constitute end portions and serve to connect the portions of the material on either side of the slot.

The members 22 and 23 re-enforce the blade and practically assure that the blade as a whole, lncluding the'cutting edges 11 and 12, will always remain in a straight line when the blade is clam ed in'a holder.

A typical hol er, known er se, is shown in Fig. 3 and comprises a ase portion or guard 24 and a cap 25. Cap 25 is also shown in dash and dot lines in Fig. 2. Base portion 24 is provided with a longitudinal recess 26 while cap 25 is provided with a longitudinal ridge 27 which is adapted to fit into recess 26; Each of the four corners of cap 25 is provided with a depending lug 35. The center of cap 25 is rovided with a screw threaded pin 28, wh1ch projects through a corresponding hole 33 in base 24 and engages threads formed in a handle. When the handle is screwed tightly on pin 28 base 24 and cap25 are drawn together.

' 7 Blade 10 is adapted to be placed between base portion 24 and cap 25, as is clearl shown in Fig. 3. The centra slot in the blade is large enough to accommodate pin 28 while the width of the slot near its ends is reduced so that the ridge 27 on cap 25 engages the sides of the slot at these points and accurately positionsthe blade with respect to the holder. Lugs-35 on the cap are provided at the corners and are longitudinally in alignment with the lateral" portions of the blade when the parts are clamped to ether and serve to protect the corners of the lade.

The radius of curvature of that ortion of base 24 which engages the blade 18 greater than the radius of curvature of the portion of cap 25 which engages the blade. In the event that a blade of uniform thickness were employed this difference of curvature would result in the blade being clamped between base 24 and cap 25 along two lines, indicated at 29 and 30 in Fi 3. The more central part of the blade ad acent the slot would not be clamped at all and this contributes to the aforementioned warping of the cutting edges. In my improved blade the more central portion is clamped between the base and the cap, as is shown at 31 and 32, as well as alon the lines 29 and 30. This extra clamping o the blade results from the extra thickness of the blade adjacent the center slot caused by the presence of the re-enforcing members 22 and 23 Hence, the re-enforc-ing members serve the double purpose of re-enforcing the blade and allowin it to be more securely clamped in the hol er, both of which reduce and practically eliminate any warping of the cutting edges of the blade.

While I have shown and described a preferred embodiment of m invention, it is to be understood that modi cations thereof fall within its scope. For instance, the re-enforcing members mag be separate pieces of metal secured to the lade as bl welding or riveting. However, for the sa e of cheapness in manufacture, I prefer to form the reenforcing members from the material of the blade itself, as described The breadth of my invention is to be gauged by the appended claims viewed in the. ight of the prior art.

\Vhat I claim is:

1. A razor blade of the double edge type formed of a single piece of metal and comprising side and end portions bounding a central longitudinal slot, cutting edges on each of the side portions and reenforcing means adjacent the slot comprising longitudinally extending flanges integral with the side portions.

2. A razor blade of the double edge type formed of a single piece of metal and comprising side and end portions bounding a central longitudinal slot, cutting edges on each of the side portions and reenforcing means adjacent the slot comprising longitudinally extending folds integral with and in contact with the side portions.

3. A razor blade of the double edge type formed of a single piece of metal and comprisin side and end portions bounding a central longitudinal slot, cutting ed es on each of the side portions and reen orcing means adjacent the slot comprisin longitudinally extending flanges formed y bending out material of the central portion of the blade to form the slot.

4. A razor blade of the double edge type formed of a sin le piece of metal and comprisin side and end portions bounding a central longitudinal slot, cutting edges on each of the side portions and reenforcing means adjacent the slot comprising longitudinally extending flanges formed by bending out material of the central portion of the blade to form the slot and folding such material onto the side portions.

5. A razor blade of the double edge type formed of a single piece of metal and comprisin side and end portions bounding a contra longitudinal slot, cutting edges on each of the side portions and reenforcing means adjacent the slot comprising longitudinally extending flanges integral with the "side portions, said flanges being narrower at the ends than in the center.

6. A razor blade of the double edge type comprising side and end portions bounding a central longitudinal slot, said side and end portions being integral, a cutting edge on each of the side portions and reenforcing metal pieces adjacent to the longitudinally extending sides of the slot and secured to the side portions.

7. A razor blade of the double edge type comprising side and end portions bounding a central longitudinal slot, said side and end portions being integral, a cutting edge on each of the side portions and reenforcing metal pieces adjacent to the longitudinally extending sides of the slot and secured in contact with the side portions.

8. A razor blade of the double edge type comprising side and end portions bounding a central longitudinal slot, said side and end portions being integral, a cutting edge on each of the side portions and reenforcing metal pieces adjacent to the longitudinally extending sides of the slot and secured in contact with the side portions, said pieces being narrower at the ends than at the center. In testimony whereof I have aflixcd my signature.

HARRY SWAN. 

